Ruling · Dattātreyotpatti (Datta Jayanti) · 2009

Tuesday 1 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 57 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Tuesday 1 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:51
Pūrṇimā begins 17:54:27
16:3216:5617:2017:4418:0818:3218:5619:20

57 of 115 minutes covered, the last 57

Evening of Wednesday 2 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:51
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 115 minutes covered

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 17:54 on Tue 1 Dec to 15:30 on Wed 2 Dec.

    2009-12-01T09:54:28Z → 2009-12-02T07:30:27Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 1st, 16:56–18:51 on the 2nd.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 57 of 115 minutes on the 1st and 0 of 115 on the 2nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Only one evening qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 3410 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2009: Tuesday 1 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2009 falls on Tuesday 1 December. Pūrṇimā runs from 17:54 on Tue 1 Dec to 15:30 on Wed 2 Dec and covers 57 of 115 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/2009/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 1 Dec
Ahargaṇa, classicalDisc centre, no refractionTue 1 Dec
compat-drikpanchangComparison profileTue 1 Dec
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/dattatreyotpatti · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 15 Dattatreyotpatti (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 1stCoveredSunset 2ndCoveredRuled
Los Angeles01:54 → 23:3016:43112 min16:430 min1 Dec
Chicago03:54 → 01:3016:20117 min16:200 min1 Dec
Jersey City04:54 → 02:3016:29116 min16:290 min1 Dec
Port of Spain05:54 → 03:3017:41100 min17:420 min1 Dec
London09:54 → 07:3015:54127 min15:540 min1 Dec
Durban11:54 → 09:3018:4281 min18:430 min1 Dec
Dubai13:54 → 11:3017:28107 min17:280 min1 Dec
Delhi15:24 → 13:0017:23109 min17:230 min1 Dec
Kolkata15:24 → 13:0016:51105 min16:510 min1 Dec
Singapore17:54 → 15:3018:5596 min18:550 min1 Dec
Sydney20:54 → 18:3019:5115 min19:520 min1 Dec
Suva22:54 → 20:3019:290 min19:3061 min2 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dattatreyotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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